horton



A. A. HORTON April 12, 1932.

- CALCULATING MACHINE Original Filed Jan. 29 1926 4Sheets-Sheet l ATTORNEYS April 12, .1932. RTON 1,853,053

CALCULATING MACHINE Original Filed Jan. 29, 1926 Sheets-Sheet 3 Y 5. E4. 255 286 V INVENT R 2m ATITORNEYS April 12, 1932. A. A. HORTON CALCULATING MACHINE 4 Sheets-Sheet, 4

Original Filed Jan. 29, 1926 ATTORNEY Patented Apr. 12, 1932 UNITED STATES PATENT OFFICE ALLEN A. HORTON, OF PLYMOUTH, MICHIGAN, ASSIGNOR T BURROUGHS ADDING MACHINE COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN CALCULATING morrmn Original application filed January 29, 1926, Serial No.

1926. Serial This'invention relates to a calculating machine particularly one that will both add and on thesame counter with the same transfer mechanism acting to either carry or borrow. Although the invention is illustrated with said machine it is not necessarily limited to it as will later appear.

The general object of the invention is to provide an improved calculating machinethat will both add and subtract on the same counter with a single, simple transfer mechanism acting to both carry and borrow on said counter.

A more particular object is to provide an improved transfer mechanism for calculating machines.

Other objects and advantages vention will hereinafter appear.

An embodiment of the invention is illustrated in the accompanying drawings in which:

Fig. 1 is aside elevation of my calculating machine sho ing some of the controlling mechanism therefor.

Fig. 2 is a side elevation of the rear end of the calculating machine with the side plate removed to show some of the interior mechanism.

Fig. 3 is a spreadperspective view of a section of the transfer mechanism. 1

Fig. 4 is a section on the line 44 of Fig. 2.

Fig. 5 is a. side elevation of the transfer mechanism showing the counter in engagement with the actuator racks and the transfer mechanism in a position prior to a carry being effected.

Fig. 6 is a side elevation similar to Fig. 5 showing the position of the parts when an initial carry has been effected.

Fig. 7 is a side elevation similar to Fig. 5 showing the counter out of engagement with of "the in- 84,616. Divided and this application filed August 6, No. 127,509.

the racks 'and the parts in the condition they occupy after a full carry has been efiected.

Fig. 8 is a side elevation similar to Fig. 5 showing the transfer mechanism in condition for borrowing and the parts in the position they occupy as an initial carryis being completed.-

Fig. 9 isa view similar to Fig. 8 with the counter out of engagement with the racks and the parts in the position they occupy after a carry has been effected.

Fig. 10 is a side elevation of the control mechanism showing the parts in the position they occupy when set so that operation of the machine will. automatically condition the transfer mechanism to borrow instead of carry.

Fig. 11 is a fragmentary view similar to Fig. 10 showing the parts in the position they occupy after the transfer mechanism has been. moved to subtraction or borrow position.

The construction and operation of the calculating machine has been described in detail in my co-pending application referred to and will be-described only briefly here. Insofar aspossible the same reference numerals will be used to designate similar parts in the two applications.

The machine is provided with a plurality of'banks of depressible amount keys 10 shown in Fig. 2, having stems 11 which project through the keyboard and are adapted to be positioned in the path of differentially located stops 252 on the stop bars 233. There is one of these stop bars for each bank of amount keys, their forward ends being slidably mounted and their rear. ends being connected to the vertical arms 234: of actuator segments 235, which operate the totalizer or counter pinions. The stop bars are normal- 1y urged forward by springs 250 which thereby also normally urge the actuator racks counter-clockwise. These parts are held against movement by the cross bar 255 of a bail 256, which is normally urged in a counter-clockwise direction by the spring 258. The bail is prevented from moving in a counter-clockwise direction by the engagement of a cam roller 260 carried by it with the cam surface of a cam 73 which is rocked by the main shaft 71 of the machine (Fig. 1). When the handle is pulled forward the cam 73 is rocked to present a surface of the cam to the roller 260 which will permit the roller with its bail to move counter-clockwise and release the actuator racks which thereupon move counter-clockwise to differential positions determined by the engagement of the stops 252 on the stop bars 233 with the stems of the depressed amount keys. Each actuator rack carries a type bar 264 that is properlypositioned at t e printing line as the actuators move to differential positions. Upon the return stroke of the machine the bail 255 is moved clockwise to restore all the actuator racks to their normal position.

When addition is to be performed the counter, which comprises a plurality of pinions 236 adapted to mesh with the actuator racks 235, is moved into engagement with the racks at the end of the forward stroke of the machine, so that when the bail restores the racks to normal position, the pinions are moveddistances corresponding to the differential positions of the actuators. return stroke the counter is moved out of engagement with the racksand the amount set up is'thus stored in the counter.

When a total is to be taken from the counter, the latter is moved into engagement with the racks at thebeginning of the forward stroke and prior to the ascent of the racks. The counter j inions are provided with stops which stop 1; em at zero when they are rotated backward. As the racks ascend in taking a total the counter pinionsare rotated to Zero'and the position of the racks is thereby determined. This also positions the type bars so that the total can be printed. At the end of the forward stroke and while the counter is clear or at zero position, it is moved out of engagement with the racks and it so remains during their restoration to normal osition. The same action takes place in. taking a subtotal except that the-nose 400 of awl 399 is not moved to active position and the counter remains in engagement with the racks during both their ascent and their descent. 'When the total or subtotal key is de ressed a lever 358 is raised through suit-' ab e connections into the path of the cranked end of a shaft 446 to thereby block the counter pinions so that they will stop at zero when rotated backward by the ascent of the racks. The pinions thus determine the position of the racks in the taking of a total.

When subtraction is to be performed the counter pinions are moved into engagement with the actuator racks at the beginning of the forward stroke of the machine and prior to their ascent the same as in taking a total but instead of the counter pinions being blocked at zero position they are free to move past the 0 position and the differential po- At the end of thesitions of the racks with their type bars are determined by the engagement of the stop bars with the amount keys. During the forward stroke and as the actuators are released, the counter pinions are moved in the reverse direction to that in which they were rotated for addition and the amount set up in the machine is subtracted from the counter, which is moved out of engagement with the racks at the end of the forward stroke.

Suitable transfer mechanism must be provided for carrying a unit from a pinion of lower to a pinion of higher order when the lower order pinionhas rotated a full revolution or from the 9 to its 0 position. Various mechanisms have heretofore been de vised for this purpose but these mechanisms are peculiarly adaptedto transfer only when the counter is being rotated in a direction to perform addition and are not operable to borrow or transfer in-the reverse direction if the counter should be reversely rotated. Usually a separate set of pinions is employed for performing subtraction and a separate transfer mechanism is provided for this addi-- tional set of pinions or if a single transfer mechanism is employed, it operates in the same direction as the two sets of pinions as, for example, in Rinsche Patent No. 1,172,484, February 22, 1916, but is not suitable for both carrying and borrowing on one set of pinions. In the present invention, however, a single set of pinions is used for both addition and subtraction and one transfer mechanism is employed for both carrying and borrowing with provision for automatically conditioning it to perform either of these operations as the machine is conditioned to perform ad- 'dition or subtraction.

The counter comprises a plurality of pinions 236 rotatably mounted on a shaft 376 carried by the side arms 377 connected to the rock shaft 378 pivoted in the side plates 55. 'The shaft 378 upon which the side arms of the counter frame are mounted also has fixed to it an arm 380 (Fig. 3) carrying a cam roller 381 adapted to be engaged by the ed e of a cam plate 382 forming one'side of a yo e shaped member 384 fixed to a rock shaft 383 pivoted in the side plates 55. A pitman 387 is connected to the lower side of the cam plate 382 as illustrated in Fig. 3. From Fig. 10 it will be clear that when the pitman 387 is moved rearwardly the plate 382 will be moved counter-clockwise to cam the counter into engagement with the racks and when the pitman 387 is pulled forwardly the plate 382 will be rocked clockwise to permit the counter to be moved out of engagement with the racks by the spring 385 (Fig. 3).

As above set forth, the counter is rocked into and out of mesh with the actuators by means of the pitman 387 (Fig. 1) pivoted at its rear end to the rocking cam plate 382 and having its forward end forked and provided with devices for actuation by the drive shaft and associated parts. The pitman is reciprocated by a cam 74 rocked by the main drive shaft 71 and carrying studs 200 and 395 for engagement with pawls. carried by the pitman.

The normal position of the parts is shown in Fig. 1. When-the machine is given a forward stroke, the cam plate 74 is rocked counter-clockwise and during this movement the studs 200 and 395 do not act on the pitman. As the end of the forward stroke is reached, the stud 395 passes a pass-by pawl 393 pivoted to the upper arm of the pit-man and held in position by a spring 394 so that, at the beginning of the return stroke, the stud engages the shoulder 396 of said pawl and moves the pitman rearwardly to move the counter into engagement with the racks. Near the end of the return stroke the stud 200 engages the nose 391 on the lower arm of the pitman and returns it forwardly to rock the counter out ofengagement with the racks. This is the normal action of the-pitman for addition.

When a total is to be taken the total key T is depressed (Fig. 1) which rocks a pivoted member 367 downwardly in a counter-clockwise direction. This member is connected by means of a connection 406 to a pawl 404 ivoted on the lower arm of the pitman 387 and the downward movement of the member serves, by means of this connection, to move the pawl 404 into the path of the stud 200. The member 367 contacts a pawl 399 pivoted to the upper branch of the pitman and when the member 367 is moved downwardly by the total key the pawl 399 is moved down to a position such that its nose 400 is in the path of the stud 395. The pawl 399 has a central projection 401 which contacts the tail of the pawl 393 to move it to inactive position when the pawl 399 is moved downwardly by depression of the total key. Accordingly, when the machine is given a forward stroke under theseconditions, the stud 200engages the pawl 404 and moves the pitman 387 rearwardly at the beginning of the forward stroke to thereby move the counter into engagement with the racks at the beginning of the forward stroke. At the end of the forward stroke, the stud 395 engages the hook 400 of pawl 399 and pulls the pitman 387 forwardly to disengage the counter from the racks. During the return movement of the cam plate 74 the stud 395 I has no effect on the pitman as the pawl'393 is held out of active position by the projection 401 and since the pitman is already in its forward position there is no'movement caused by stud 200 contacting the nose 391 of the lower branch of the pitman.

When subtraction is to subtraction lever 226 is moved from the position of Fig.1 to that of Fig. 10. This lever which is held out of active stud 200 passes by the pawl 404, neither of be performed, the

is connected by a link 363 to a yoke-shaped arm 362 having a portion contacting the tail of the member 367 so that, as the subtraction lever is moved rearwardly, the arm 367 is rocked downwardly to the position of Fig. 10. .T his action moves the pawl 404 into the path of the stud 200 by means of the connection 406. The pawl 399 is also moved down.

to position its hooked end 400 in the path of the stud 395 and to cause its central proje'itlOIl 401 to contact the tail of pawl 393 to move the latter to inactive position. Accordingly, at the beginning of the forward stroke, the stud 200 engages the pawl 404 to move the pitman 387 rearwardly to rock the counter into enagement with the racks where it remains until near the end of the forward stroke when the stud 395 engages the hooked end 400 of pawl 399 and pulls the pitman 387 forward to rock the counter out of engagement with the racks. During the return movement the stud 395 passes the pawl 393 said studs acting to move the pitman upon the return stroke.

The transfer mechanism includes a plurality of toothed transfer segments 413 piv; oted on a shaft 414 carried by the side plates 55, there being one transfer segment for each counter pinion. In order to avoid confusion the description will be directed primarily to the transfer devices for one pinion, it being understood that there is a similar device for each pinion.

The transfer segment 413 is normally held in the position shown in Fig. 5 by the engagement of a lateral lug 416 on its upwardl extending arm 416 in a notch in the bell cran detent 420 which is urged in a clockwise direction by the spring 420. The bell crank detent 420 is controlled by a pinion of next lower order than the one with which the transfer segment engages as will be clear from Fig. 3. The downwardly extending arm 420 of the detent extends behind a pivoted tripping pawl 422 having a tooth-like projection 423 adapted to be engaged by a wide tooth 433 on the pinion 236. The tripping pawl is pivoted on a shaft 423 carried by the side arms 377 of the counter frame so that the pawl moves with the counter as it is rocked into and out of engagement with the racks, and it is urged in a counter-clockwise direction by a spring 428, one end of which is connected to the tail of the pawl, and

position and the the other end of which is connected to a latch chine is performing addition the transfer segments are normally urged in a clockwise direction by springs 417 connected at one end tothe arms 416 of the segments and at their other ends to a rod 417 carried by the cross bar 418 of a ivoted bail 418.

A restoring bail or the segments is provided comprising'a cross shaft 430 carried by arms 429 movable with the rocking yoke 384. This bail moves up and down in slots 431 in the side plates 55 (Fig. 1) and between the downwardly extending arms 415 of the transfer segment from the position between the narrow opening between said arms to the wider opening between them. As it moves .down it engages the real; arm 415 of the segment and cams it counter-clockwise to normal position, the parts being proportioned sothat the segment is moved sufiiciently to insure that the detent 420 will catch on the lug 416".

The operation of the transfer mechanism for carrying when the machine is performing addition is as follows:

The normal position of the parts with the counter in engagement with the racks and the transfer mechanism in position before any carry has been eflected is illustrated in Fig. 5. When one of the pinions is rotated from its 9 position illustrated in Fig. 5 to its 0 9 433 on the pinion engages the projections 423 on the tripping pawl 422 andcams it rearwardly to 'the position of Fig. 6 where the pawl is latched in place by the latch 426 which snaps downwardly to move the shoulder 425 in front of the lug 424. This action is what is called an initial carry.

Important features are that the tripping pawls are firmly latched in initial carry position so that they are not disturbed by jarring of the machine and that the initial carry for each pinion is individual, that is, it is not dependent on a restraining member common to all the pawls. Each pawl isoperated and latched individually.

In the initial carry position the rear side of the tripping pawl 422 is in engagement with the downwardly projecting arm 420 of the detent 420 as shown in Fig. 6. When the counter is moved rearwardly out of engagement with the racks to the position of.Fig. 7 it carries the tripping pawl 422 with it and the rear side of this pawl, engaging the arm 420 moves the detent 420 counter-clockwise and releases the transfer segment 413 which thereupon is moved by the spring 417 a distance sufficient to move the pinion that engages it one tooth. In this manner the transfer mechanism is released for operation by the movement of the counter into engagement with the transfer mechanism. In moving the counter rearwardly the pit-man 387 is pulled forward which rocks the cam plate 382 clockwise and raises the restoring bail 430 upwardly to the position illustrated in position shown in Fig. 6, the wide tooth,

Fig. 7 in the wide space between the arms 415 of the transfer segment which permits the segment to turn on its pivotwithout interference from the restoring bail. The bail is raised prior to the moving of the segments by reason of the fact that, as the cam plate 382 moves counter-clockwise toward its Fig.

3 position, the roller 381 rides on the raised portion of the cam and the totalizer cannot move rearwardly to trip the carry segments. During this movement ofthe ca'm plate the bail 430 is rising and it reaches the position shown in Fig. 7 at about the time the roller 381 reaches the depressed part of the cam late. This bail also acts as a limit stop or the segment to limit its movement to an amount just sufiicient to move its pinion one tooth. As the bail rises, it contacts the ends of all the latches 426 and raises them out of engagement with the lugs 424 on the tripping pawls 422, whereupon these pawls are restored to normal position by the springs 428. When the bail is lowered again the latches ride on the lugs 424 in the position illustrated in Fig. 5.

The transfer mechanism is restored to normal as the counter is moved into engagement with the racks. As this movement occurs the bail 430 is lowered and it engages the rear arms 415 of the transfer segments to cam them counter-clockwise to restore all of the tripped segments to normal after the pinions have been moved out of engagement with the segments. The segments are then latched in position by the detents 420, the notches 'of which snap over the lateral lugs 416. on the segments. The parts then occupy the position shown in Fig. 5.

In taking a total the total key T is depressed, which rocks the lever 358 counterclockwise to move its end in front of the cranked end 446 of a shaft 447 pivoted in side arms 377 of the counter frame. A locking plate 448 is fixed to the shaft 447 and the lat} ter is normally urged clockwise by a spring 450 which maintains the locking plate in a substantially horizontal position as shown in Fig. 5. When the counter is rocked into engagement with the racks in the taking of a total, the engagement of the crank 446 with the end of lever 358 turns the shaft 447 on its axis counter-clockwise and rocks the plate 448 behind the projections 422" on the tripping pawls 422. This prevents the pawls from moving rearwardly and hence when the pinions are rotated backward in the ascent of the racks, they are stopped in 0 position when the broad tooth 433 on each engages the upper face of its tooth 423 on its tripping pawl.

An important advantage of the invention is that it is not necessary to give the machine a spacing stroke prior to taking a total. T he transfer segments are restored to normal whenever the counter is moved into engagement with the racks. If a number of items have been accumulated and a total is taken, the movement of the counter into engagement with the racks at the beginning of the forward stroke of the machine restores all the tripped carry segments because the bail 430 is lowered to restore the segments simultaneously with the moving of the counter into engagement with the racks.

In taking a subtotal, the action is the same as in taking a total except that the counter is not moved out of engagement withthe racks at the end of the forward stroke.

When subtraction is performed, the counter pinions are rotated in the opposite direction to that in which they are rotated for addition and the transfer mechanism mustelfect borrowing from a pinion of higher order to one of lower order, that is, the action is the reverse of what it is in addition.

Each of the broad teeth 423 on the tripping pawls 422 is shaped so that it will cam its pawl. rearwardly when the pinion is moving in either direction. In other words, the pawls are not only cammed rearwardly when the pinions move from 9 to 0, but also when they move from 0 to 9. Accordingly, the transfer mechanism is set for the initial carry in subtraction in the same manner as in addition. The carry is also completed in the same general way,that is, when the counter is moved out of engagement with the racks, the tripping pawls 422 move the detents 420 to release the transfer seg ments. However, in order to effect a borrow, it is necessary that the transfer segments move in the opposite direction to which they move for effecting a carry. This reversal of movement is achieved in the present invention by changing the effective direction of the action of the springs 417. The pivoted bail 418 is swung from the position shown in Fig. 5 to that shown in Fig. 8 so that when the transfer segments are released, the springs move them counter-clockwise instead of clockwise as they are moved when the parts are in the condition shown in Fig. 5. Accordingly, when the transfer segments are released, those that have been tripped are moved to borrow a unit from a pinion of higher order for a pinion of lower order. Fig. 8 shows the position of the parts after an initial borrow has been completed in subtraction. The position of the parts when the borrow is completed is illustrated in Fig. 9 where the transfer segment has been moved by the spring 417, the restoring bail 430' having moved up to permit a movement of the segment equal to one tooth on the counter pinion. The segments are restored to normal postion by the bail 436 in the same general manner as heretofore described and it will be noted that the one bail serves to limit the movement of the segments to one tooth distance in both directions, to restore the segments to normal position from both the carry and the borrow positions, and to raise the latches 426 to permit the tripping pawls to move back to normal.

The automatic conditioning of the transfer mechanism for carrying or borrowing is accomplished through connections from the subtraction lever 226. This lever is connected by a link 363 to a bell crank lever 362 having a rearwardly extending arm 362 whose bifurcated end engages over a. stud 439 on a pivoted arm 439 whose lower end is connected to one end of a spring 437 the other end of the spring being connected to an arm of a pivoted cam plate 436*. When the machine is in condition for addition, the parts occupy the position illustrated in Fig. 1.

\Vhen the machine is conditioned for sub traction, the lever 226 is moved rearwardly which rocks the bell crank 362 counter-clockwise and moves the lever 439 clockwise to the position illustrated in Fig. 10. This moves the spring 437 across the pivot of the cam plate so that the spring then moves the plate counter-clockwise to the position of Fig. 10 where its shoulder 436 is in front of a stud 440 carried by the cam plate 382 connected to the reciprocating pitman 387. Accordingly, when the pitman 387 is moved rearwardly at the beginning of the forward stroke of the machine and the plate 382 is rocked counter-clockwise, the stud 440engages the shoulder 436 and moves the cam plate 436 with it. The cam plate 436 is pivoted to an arm 435 having a slotted end engaging over a stud 434 on the end of the bail 418. When the cam plate 436 is moved forward with the plate 382 the bail 418 is rocked from the position of Fig. 5 to that of Fig. 8 thereby conditioning the transfer mechanism to effect a borrow instead of a carry. This action takes place automatically as the machine is operated after being conditioned for subtract-ion.

' When the machine is conditioned foraddition after having been used for subtraction, the subtraction lever 226 is pulled forwardly which rocks the bell crank lever 362 in a clockwise direction, thereby moving the lever 439 from the position of Fig. 10 to that of Fig. 1. This moves the spring 437 across the pivot of the cam plate 436 which there upon is moved from the position of Fig. 10 to that of Fig.1 by the spring. The hookshaped end 436 of the cam is then in front of a stud 443 carried by the pivot of pitman 387 and as the pitman is moved rearwardly to throw the counter into engagement with the racks this stud engages the hooked end of the cam and moves it together with the In this manner the same set of counter pinions is used for both'addition and subtraction and the same simple transfer mechanism is used to effect both a borrow and a carry, the parts being automatically conditioned to achieve this result by the simple movement of a lever 226 from one position to another and the-subsequent operation of the machine, The transfer mechanism is simple, no minutely machined parts are necessary, each counter pinion controls its own transfer devices, no spacing stroke is necessary, and the mechanism is returned to normal by a single hail from both its carry or its borrow positions.

It is to be understood that the structure shown is for purposes of illustration only and that variations may be made without departing from the spirit and scope of the invention as defined by the appended claims.

I claim:

1. A calculating machine having actuator racks, a frame carrying a plurality of counter pinions having transfer projections, said frame being pivoted adjacent said racks so that it may be rocked to rock said counter into and out of engagement with said racks, trip pawls pivoted on said frame to swing about an axis substantially parallel to the axis of said frame, said pawls having projections positioned for engagement by said transfer projections when the pinions pass from their 9 to or throu tions and vice versa where y said pawls are moved to initial transfer position, latches pivoted on said frame for holding said pawls in initial transfer position after they are moved to said position, pivoted transfer segments positioned adjacent said pinions on the side opposite said'actuator racks, means urging said segments in a direction to effect a transfer, latches normally restraining said segments, said transfer segment latches having portions positioned for engagement by said latched trip pawls when said c'ounter frame is moved to rock said pinions out of engagement with said actuator racks whereby said transfer segment latches are released, and a restoring bail for restoring said transfer segments.

2, A calculating machine having actuator racks, a frame carrying a plurality of counter pinions having transfer projections, said frame being pivoted adjacent said actuator racks so that it may be rocked to rock said counter into and out of en agementwith said racks, trip pawls pivote on said frame to swing about an axis substantially parallel to the axis of said frame, said pawls having projections positioned for engagement by said transfer projections when the pinions pass from their 9 to or through their 0 positions and vice versa whereby said pawls are moved to initial transfer position, latches pivoted onsaid frame for holding said pawls in initial transfer position after 11 their 0 posi-- they are moved to said position, pivoted transfer segments positioned adjacent said pinions on the side opposite said actuator racks, means urging said segments in a direction to effect a transfer, latches engaging the upper ends of said segments for normally, restraining them against movement, said latches having portions positioned for engagement by said latched trip pawls when the counter frame is moved to rock the pinions out of engagement with the actuator racks to thereby release said transfer segment latches, and a restoring bail adapted toengage the lower ends, of said transfer segments to restore them to normal, said latches for said trip pawls having portions positioned for engagement by said restoring bail whereby said latches are released.

3. A calculating machine having actuator racks, a frame carrying a plurality of counter pinions having transfer projections, said frame being pivoted adjacent saidracks so that it may be rocked to move the counter into and out of engagement with said actu ator racks, trip pawls pivoted on said frame to swing about an axis substantially parallel. to the axis of said frame, said pawls having projections positioned for engagement by said transfer projections when said pinions pass from their 9 to or through their 0 positions and vice versa whereby said pawls are moved to initial transfer position,

latches pivoted on said frame and extending toward said segments for holding said pawls in initial transfer osition after they are moved by said transfdr projections, pivoted transfer segments positioned adjacent said pinions on the side opposite said actuator racks, means urging said segments in a direction to effect a transfer, bell crank latches for restraining said segments, one arm of said bell crank latches being adapted to engage said segments and the other arm being positioned for engagement by said latched trip pawls when said counter frame is rocked to move the pinions out of engagement with the actuator racks, converging arms on the lower portions of said transfer segments, and a restoring bail between said converging arms for restoring said segments, said trippawl latches having portions extending to a position for enabling said latches to be re leased by said bail.

4-. The combination in a calculating machine having a counter comprising a plurality of counter pinions, of a transfer mechanism having a plurality of sets of transfer devices, each set comprising a transfer element for one pinion urged in a direction to effect a transfer, a detent for normally restraining said element, a tri ping pawl movable to initial carryposition y a counter pinion'of another order, a latch for holding said tent when the counter is brought into engagement with the transfer mechanism, and a restoring bail for restoring the transfer ele ments, said bail also serving to trip the latches of the tripping pawls, Y

5. The combination in a calculating machine having a series of actuator racks and a counter comprising a series of counter pinions carried by a frame which is movable to move the counter into and out of engagement with the racks, of a transfer mechanism having a plurality of sets of transfer devices, each set comprising a trippingjpawl carried by the frame and adapted to be set in initial carry position by movement of its counter pinion in either direction, a latch for bolding said pawl in initial carry position, a transfer segment for the counter pinion of next highest order, said segment being mounted independently of the frame and being movable in two directions, actuating means for the segment, means for changing the direction of action of said actuating means, and a detent for normally restraining the segment against movement in 1 either di'rec- I tion, said pawl being positioned so that when it has been set. in initial carry position and When the counter is moved out of engagement withthe racks and into engagement 6% with the transfer segments, it will trip the detent for the transfer segment of the pinion of next high order to permit said segment to move to effect a'transfer.

6. In a transfer mechanism, a pivoted transfer member movable in one direction from a normal position to effect a carry and in the opposite direction to effect a borrow, said transfer member having spaced arms which converge toward one anotherand the 40 converged ends of which are spaced from one another, a movable restoring member be tween said arms, and means for moving said restoring member toward the converged ends ofsaid arms to restore said transfer member to normal from either of its moved positions, said restorin member after restoring said transfer memberbeing positioned between the spaced ends of said armsto prevent movement of the transfer member until the 'restoring member. has been moved from between spaced ends of said arms.

In testimony whereof I have subscribed my name.

ALLEN A. HORTON. 

